:root {
  color-scheme: light;
  --intro-green: #20bf60;
  --intro-green-strong: #159447;
  --intro-text: #111b21;
  --intro-muted: #667781;
  --intro-line: #e4e9eb;
  --intro-panel: #f2f5f5;
  --intro-warning: #d9363e;
  --intro-warning-bg: #fde9eb;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; }
body {
  background: #f5f7f7;
  color: var(--intro-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.65;
  letter-spacing: 0;
}

.intro-page-shell {
  display: flex;
  flex-direction: column;
  width: min(100%, 520px);
  min-height: 100vh;
  margin: 0 auto;
  overflow: hidden;
  background: #fff;
  border-inline: 1px solid rgba(17, 27, 33, 0.06);
}

.intro-site-header {
  display: flex;
  flex: 0 0 76px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 22px;
  border-top: 4px solid #f7f1ed;
  border-bottom: 1px solid var(--intro-line);
}

.intro-brand-lockup { display: flex; min-width: 0; align-items: center; gap: 11px; }
.intro-brand-icon { width: 36px; height: 36px; object-fit: contain; }
.intro-site-header h1 { display: grid; min-width: 0; margin: 0; line-height: 1.15; }
.intro-site-header h1 strong { font-size: 18px; font-weight: 750; }
.intro-site-header h1 span { margin-top: 3px; color: var(--intro-muted); font-size: 10px; font-weight: 600; white-space: nowrap; }
.intro-language-picker { position: relative; flex: 0 0 auto; }
.intro-language-button {
  display: flex;
  min-width: 82px;
  height: 36px;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0 8px;
  color: var(--intro-text);
  background: #fff;
  border: 1px solid var(--intro-line);
  border-radius: 5px;
  font: inherit;
  font-size: 11px;
  font-weight: 650;
  cursor: pointer;
}
.intro-language-button:hover, .intro-language-button[aria-expanded="true"] { background: #f5f7f7; }
.intro-language-button:focus-visible, .intro-language-menu button:focus-visible { outline: 2px solid rgba(32, 191, 96, 0.42); outline-offset: 2px; }
.intro-language-chevron { transition: transform 150ms ease; }
.intro-language-button[aria-expanded="true"] .intro-language-chevron { transform: rotate(180deg); }
.intro-language-menu {
  position: absolute;
  z-index: 20;
  top: calc(100% + 7px);
  right: 0;
  width: 132px;
  padding: 5px;
  background: #fff;
  border: 1px solid var(--intro-line);
  border-radius: 6px;
  box-shadow: 0 12px 28px rgba(17, 27, 33, 0.16);
}
.intro-language-menu[hidden] { display: none; }
.intro-language-menu button {
  display: flex;
  width: 100%;
  min-height: 34px;
  align-items: center;
  padding: 0 10px;
  color: var(--intro-text);
  background: transparent;
  border: 0;
  border-radius: 4px;
  font: inherit;
  font-size: 12px;
  text-align: left;
  cursor: pointer;
}
.intro-language-menu button:hover { background: #f2f5f5; }
.intro-language-menu button[aria-checked="true"] { color: #0d7d3b; background: #eaf8ef; font-weight: 700; }
.intro-content { flex: 1; padding: 20px 20px 40px; }

.intro-alert {
  display: flex;
  min-height: 42px;
  align-items: center;
  gap: 9px;
  margin-bottom: 19px;
  padding: 9px 15px;
  color: #c92f36;
  background: var(--intro-warning-bg);
  border-left: 4px solid var(--intro-warning);
  border-radius: 0 7px 7px 0;
  font-size: 15px;
  font-weight: 700;
}

.intro-alert svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-width: 1.5; }
.intro-content h2 { margin: 0; font-size: 18px; line-height: 1.55; letter-spacing: 0; }
.intro-copy h2, .intro-review h2 { text-align: center; }
.intro-copy p, .intro-review p { margin: 6px 0 0; line-height: 1.65; overflow-wrap: anywhere; }
.intro-section-title { margin-top: 20px !important; margin-bottom: 8px !important; }

.intro-status-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.intro-status-list li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  min-height: 46px;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--intro-panel);
  border-radius: 7px;
  line-height: 1.55;
}
.intro-status-list svg { width: 18px; height: 18px; color: #6f828c; fill: currentColor; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.7; }
.intro-status-list li:nth-child(2) svg, .intro-status-list li:nth-child(3) svg { fill: none; }
.intro-review { margin-top: 19px; }
.intro-review p + p { margin-top: 11px; }

.intro-review-button {
  display: flex;
  width: 100%;
  min-height: 54px;
  align-items: center;
  justify-content: center;
  margin-top: 23px;
  padding: 12px 20px;
  color: #fff;
  background: var(--intro-green);
  border-radius: 5px;
  box-shadow: 0 8px 18px rgba(32, 191, 96, 0.2);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
.intro-review-button:hover { background: var(--intro-green-strong); box-shadow: 0 9px 20px rgba(21, 148, 71, 0.24); }
.intro-review-button:active { transform: translateY(1px); }
.intro-review-button:focus-visible { outline: 3px solid rgba(32, 191, 96, 0.35); outline-offset: 3px; }

.intro-site-footer {
  display: flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 8px 14px calc(8px + env(safe-area-inset-bottom));
  color: var(--intro-muted);
  background: #eef1f3;
  font-size: 12px;
  line-height: 1.2;
}
.intro-site-footer svg { width: 14px; height: 14px; fill: currentColor; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.6; }

@media (max-width: 380px) {
  .intro-site-header { padding-inline: 16px; }
  .intro-content { padding-inline: 16px; }
}
@media (min-width: 521px) {
  body { padding-block: 18px; }
  .intro-page-shell { min-height: calc(100vh - 36px); }
}
@media (prefers-reduced-motion: reduce) { .intro-review-button, .intro-language-chevron { transition: none; } }